Core-sticking pencil glue and preparation method thereof

Abstract

The invention discloses a core-sticking pencil glue and a preparation method thereof, and belongs to the technical field of adhesive. The core-sticking pencil glue comprises the following components in parts by weight: 50 to 85 parts of VAE, 10 to 20 parts of polyvinyl acetate emulsion, 20 to 50 parts of vinyl acetate-acrylic emulsion, 1 to 10 parts of an environment-friendly plasticizer, 0.2 to 0.6 part of a wetting agent, 0.1 to 0.2 part of a defoaming agent and 0.1 to 0.2 part of a preservative. When the core-sticking pencil glue is used for preparing pencils, wood flowers rolled out of thepencils can be adhered to graphite core scraps rolled out of pencil leads, and meanwhile, very high bonding strength and relatively good water resistance are achieved; therefore, the core-sticking pencil glue has a wide application prospect and market potential.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a core-adhesive pencil glue and a preparation method thereof. Background technique [0002] Pencil production process: apply the pencil core glue machine to the upper, lower and grooves of the pencil board, then combine the upper and lower (opened) boards, pressurize through the fixture, and enter the back after the glue is cured Cutting, planing, molding, painting and other processes. The main indicators of the water-based pencil lead in the application process are as follows: [0003] (1) Adhesive strength: It is required that the finished pencil should not be cracked when the end of the pencil is stressed. [0004] (2) Water resistance: After soaking in water for 1 hour, it will not crack naturally [0005] (3) Drying speed (curing speed): This characteristic affects the efficiency of pencil production, generally about 4 hours [0006] (4) Sticky core, requiring the penc...

AI Technical Summary

Problems solved by technology

[0007] At present, the main component of the existing pencil lead glue used in China is polyvinyl acetate adhesive, which has low solid content, high viscosity, and poor water resistance. Polyvinyl acetate adhesive has good adhesion to pencil wood, but it is not suitable for various Insufficient bond strength of refills, especially colored refills

In order to overcome this defect, the current remedy methods generally apply external force to squeeze the pencil lead into the pencil groove to prevent it from slipping, or soften the wood with steam, but this will increase the cost of the pencil wood and reduce the strength of the wood. , resulting in a high defective rate

Due to the poor initial viscosity of polyvinyl acetate, it takes a long time to pressurize during the production process, which prolongs the pencil bonding time and reduces production efficiency.